| Research Question | What happens to the amount of leaf disks floating in a cup if we change the intensity of light they are under? |
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| Predictions | We predict that leaf disks under the 72 Watt light bulb and 25 Watt light bulb will float but not in natural light or darkness. |
| Experimental Design | 1. Get 4 clear plastic cups and label them each differently with a pen, 72 Watt, 25 Watt, Natural light, and darkness 2. Put 50 ML of distilled water in each cup 3. With a straw blow into each cup of water for 1 minute 4. Add a drop of dish soap into each cup and mix carefully 5. Label 4 same sized syringes corresponding with the clear cups (72 Watt, 25 Watt, Natural light, and darkness) 6. Use the same preparation method as the leaf disk lab for all 4 cups using spinach 7. Place the 72 Watt cup under the 72 Watt light bulb Place the 25 Watt cup under the 25 Watt light bulb Place the natural light cup on the windowsill under the window Place the darkness cup under aluminum foil away from all light 8. Count how many leaf disks are floating after 40 hours and record your findings. |
| Conclusion | the more intense the light is the more/fast photosynthesis and cellular respiration occurs so the more leaf disks float. |
| Investigation Theme | POS |
| Grade Level | High School Students (Grades 9,10,11,12) |
| Teacher Name | Jacqueline Ellig |
| School Name | Lynden High School |
| Session | Fall 2023 |